(Select All That Apply): A nurse is assessing a client for major depressive disorder (MDD). Which of the following signs and symptoms are consistent with the clinical presentation of MDD? Select all that apply.

Choice A rationale:

"MDD is less severe than dysthymia but lasts for at least 2 years." This statement is incorrect. Major Depressive Disorder (MDD) is characterized by the presence of a major depressive episode, which can be severe and persistent, lasting for at least two weeks. Dysthymia, on the other hand, is a chronic but milder form of depression that lasts for at least two years, not MDD.

Choice B rationale:

"Dysthymia is characterized by alternating episodes of mania and depression." This statement is incorrect. Dysthymia is a chronic mood disorder characterized by a persistent low mood and other depressive symptoms. It does not involve alternating episodes of mania and depression. Alternating episodes of mania and depression are characteristic of bipolar disorder, not dysthymia.

Choice C rationale:

"Unlike MDD, dysthymia does not impair social or occupational functioning." This statement is incorrect. Both Major Depressive Disorder (MDD) and dysthymia can significantly impair social, occupational, and other areas of functioning. In fact, dysthymia's chronic nature often leads to long-term impairment in various aspects of an individual's life, similar to MDD.

Choice D rationale:

"Dysthymia is chronic and lasts for at least 2 years, but is less severe than MDD." This statement is accurate. Dysthymia is a chronic form of depression that persists for at least two years. While it may not exhibit the same level of severity as a major depressive episode, its long-term nature can still have a substantial impact on an individual's quality of life. This distinguishes it from MDD, which can have episodic occurrences.

Choice A rationale:

Acetylcholine and gamma-aminobutyric acid (GABA) are not the primary neurotransmitters involved in regulating mood, motivation, reward, cognition, and stress response. Acetylcholine plays a role in memory and muscle control, while GABA is an inhibitory neurotransmitter that helps regulate anxiety and sleep. These neurotransmitters are not as closely associated with the functions mentioned in the question.

Choice B rationale:

Glutamate is a major excitatory neurotransmitter in the central nervous system, and epinephrine (also known as adrenaline) is a hormone that prepares the body for the fight-or-flight response. While both glutamate and epinephrine play important roles in various physiological responses, they are not primarily responsible for regulating mood, motivation, reward, cognition, and stress response as mentioned in the question.

Choice C rationale:

Serotonin, dopamine, and norepinephrine are all key neurotransmitters involved in the regulation of mood, motivation, reward, cognition, and stress response. These neurotransmitters have been extensively studied in the context of mood disorders like Major Depressive Disorder (MDD). Serotonin is often associated with feelings of well-being and happiness, dopamine is linked to pleasure and reward pathways, and norepinephrine is involved in the body's stress response. Imbalances in these neurotransmitters have been implicated in the development of mood disorders.

Choice D rationale:

Endorphins and oxytocin are important neurotransmitters, but they are not as directly related to the regulation of mood, motivation, reward, cognition, and stress response as the neurotransmitters mentioned in choice C. Endorphins are known for their role in pain modulation and feelings of pleasure, while oxytocin is often referred to as the "bonding hormone" and is associated with social connections and childbirth.